Bump xterm from 4.8.1 to 4.9.0 in /web
Bump xterm from 4.8.1 to 4.9.0 in /web

Bumps [xterm](https://github.com/xtermjs/xterm.js) from 4.8.1 to 4.9.0.
- [Release notes](https://github.com/xtermjs/xterm.js/releases)
- [Commits](https://github.com/xtermjs/xterm.js/compare/4.8.1...4.9.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
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